SAGR. I am rather very much pleaſed with it, for that I
member that when I ſtudied Logick, I could never comprehend that
ſo much cry'd up and moſt potent demonſtration of Ariſtotle.
member that when I ſtudied Logick, I could never comprehend that
ſo much cry'd up and moſt potent demonſtration of Ariſtotle.
SALV. Let us go on therefore; and let Simplicius, tell me
what that motion is which the ſtone maketh that is held faſt in the
ſlit of the ſling, when the boy ſwings it about to throw it a great
way?
what that motion is which the ſtone maketh that is held faſt in the
ſlit of the ſling, when the boy ſwings it about to throw it a great
way?
SIMP. The motion of the ſtone, ſo long as it is in the ſlit, is
circular, that is, moveth by the arch of a circle, whoſe ſtedfaſt
centre is the knitting of the ſhoulder, and its ſemi-diameter the arm
and ſtick.
circular, that is, moveth by the arch of a circle, whoſe ſtedfaſt
centre is the knitting of the ſhoulder, and its ſemi-diameter the arm
and ſtick.
SALV. And when the ſtone leaveth the ſling, what is its
tion? Doth it continue to follow its former circle, or doth it go
by another line?
tion? Doth it continue to follow its former circle, or doth it go
by another line?
SIMP. It will continue no longer to ſwing round, for then it
would not go farther from the arm of the projicient, whereas
we ſee it go a great way off.
would not go farther from the arm of the projicient, whereas
we ſee it go a great way off.
SALV. Hark hither, Sagredus; this is the Quoddam reminiſci
in a ſubject well underſtood. You have pauſed a great while,
Simplicius.
in a ſubject well underſtood. You have pauſed a great while,
Simplicius.
SIMP. As far as I can ſee, the motion received in going out of
the ſling, can be no other than by a right line; nay, it muſt
ceſſarily be ſo, if we ſpeak of the pure adventitious impetus. I
was a little puzled to ſee it make an arch, but becauſe that arch
bended all the way upwards, and no other way, I conceive that
that incurvation cometh from the gravity of the ſtone, which
turally draweth it downwards. The impreſſed impetus, I ſay,
without reſpecting the natural, is by a right line.
the ſling, can be no other than by a right line; nay, it muſt
ceſſarily be ſo, if we ſpeak of the pure adventitious impetus. I
was a little puzled to ſee it make an arch, but becauſe that arch
bended all the way upwards, and no other way, I conceive that
that incurvation cometh from the gravity of the ſtone, which
turally draweth it downwards. The impreſſed impetus, I ſay,
without reſpecting the natural, is by a right line.
SALV. But by what right line? Becauſe infinite, and towards
every ſide may be produced from the ſlit of the ſling, and from the
point of the ſtones ſeparation from the ſling.
every ſide may be produced from the ſlit of the ſling, and from the
point of the ſtones ſeparation from the ſling.
SIMP. It moveth by that line which goeth directly from the
motion which the ſtone made in the ſling.
motion which the ſtone made in the ſling.